zombies map packs

is there anyway to get all the map packs, or at least the moon? i want to try it before i buy it.

yes, you need to use 'greenluma'(look it up) to make steam think you have the map packs and then just download all the files from a torrent(not allowed to give links i dont think) and put them in your game directory. There are heaps of tutorials everywhere just look on youtube for something involving greenluma and black ops map packs

seems difficult to find ncf/gcf files

Or just buy them in the Steam store, easy enough...